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· Dependent variable ( student's academic achievement ) : It depend on the way that we use it to write the score (if we write it as a letter it will be an ordinal ,but if we write it as number it will be an interval). · Independent variable ( intelligent ) : Interval, · Independent variable ( attention ) : Interval,
22.1
There is no interval in a single number.
Yes, if it is the closed interval. No, if it is the open interval.
An interval separates the distance between two numbers into equal parts. For example, the number 4 is an interval for the number 3 and the number 5.